uls-tracker
Sign in
Confidence: Medium · Source: FCC ULS · As of 2026-09-14

KJ4SR callsign genealogy

Currently held by Swain, Robert

The FCC publishes a previous_call_sign on every amateur license — a self-link to the licensee's prior callsign. Following those links produces the chain below.

Previous callsigns

Older callsigns held by KJ4SR's current licensee, walking backwards.

  1. KA4JSRcancelled· E
    Swain, Robert DCAgranted 2006-11-02cancelled 2013-01-11
  2. N7LUEactive· T
    Rasmussen, Louie AUTgranted 2021-08-02
  3. KD7LLNcancelled· T
    Rasmussen, Louie AUTgranted 2000-12-28cancelled 2001-07-17

Successor callsigns

Callsigns held now by people who previously held KJ4SR.

  1. AF6Ractive· E
    Swain, Robert DCAgranted 2021-04-27
← Back to KJ4SR License history →